Autonomy's KeyView is an alternative to Stellent. It does not cover all of the file formats that Stellent does, though many of them are probably not interesting for most applications. When I last looked at it it did not handle mail archives, though there was a plan to add it. I found it more stable than Stellent, and it has a JNI interface that works quite well. It is still quite expensive, however.
PDFBox works, but we found it to be really really slow. YMMV, -tree -- Tom Emerson [EMAIL PROTECTED] http://www.dreamersrealm.net/~tree